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Additive Manufacturing of Metallic Materials: A Review
Zhang, Y.,Wu, L.,Guo, X.,Kane, S.,Deng, Y.,Jung, Y. G.,Lee, J. H.,Zhang, J. Springer Science + Business Media 2018 Journal of materials engineering and performance Vol.27 No.1
<P>In this review article, the latest developments of the four most common additive manufacturing methods for metallic materials are reviewed, including powder bed fusion, direct energy deposition, binder jetting, and sheet lamination. In addition to the process principles, the microstructures and mechanical properties of AM-fabricated parts are comprehensively compared and evaluated. Finally, several future research directions are suggested.</P>
Some General Convergence Principles With Applications
H. Y. Zhou,G. L. Gao,G. T. Guo,Y. J. Cho 대한수학회 2003 대한수학회보 Vol.40 No.3
In the present paper, some general convergenceprinciples are established in metric spaces and then thesesprinciples are applied to the convergence of the iterativesequences for approximating fixed points of certain classes ofmappings. By virtue of our principles, most of the latest resultsobtained by several authors can be deduced easily.
METHOD FOR PRECISE CONTROLLING OF THE AT SHIFT CONTROL SYSTEM
W. GUO,S. H. WANG,C. G. SU,W. Y. LI,X. Y. XU,L. Y. CUI 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.4
The shift comfort and efficiency of Automatic Transmission in vehicle are highly influenced by the pressure ofthe clutch shift control system, especially by the electro-hydraulic clutch subsystem. In this paper, the new design principlesof electro-hydraulic clutch systems developed and modeled in detail, the clutch-to-clutch control system is analyzed in threetime intervals: oil filled phase, changing phase of clutch torque and synchronous phase of clutch speed. The demand pressuresfor the engaged clutches calculated in each phase and is precisely built up by using fuzzy slide mode control, the time ofhydraulic pressure building-up is very sensitive to the dither current in simulation. All control parameters are optimized by Cosimulationbetween software Simulink and SimulationX. Finally, the optimal algorithm of the clutch shift control is writteninto the transmission control unit of a testing vehicle. The testing results show that the suggested control strategy is effective.
Protective Efficacy of Alpha-lipoic Acid against AflatoxinB1-induced Oxidative Damage in the Liver
Li, Y.,Ma, Q.G.,Zhao, L.H.,Guo, Y.Q.,Duan, G.X.,Zhang, J.Y.,Ji, C. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.6
Alpha-lipoic acid (${\alpha}$-LA) is not only involved in energy metabolism, but is also a powerful antioxidant that can protect against hepatic oxidative stress induced by some drugs, toxins, or under various physiological and pathophysiological conditions. Here, we investigated the effect of ${\alpha}$-LA against liver oxidative damage in broilers exposed to aflatoxin $B_1$ ($AFB_1$). Birds were randomly divided into four groups and assigned different diets: basal diet, 300 mg/kg ${\alpha}$-LA supplementation in basal diet, diet containing 74 ${\mu}g/kg$ $AFB_1$, and 300 mg/kg ${\alpha}$-LA supplementation in diet containing 74 ${\mu}g/kg$ $AFB_1$, for 3 weeks. The results revealed that the addition of 300 mg/kg ${\alpha}$-LA protected against the liver function damage of broilers induced by chronic low dose of $AFB_1$ as estimated by a significant (p<0.05) change in levels of plasma total protein, albumin, alkaline phosphatase and the activities of liver glutamic-oxalacetic transaminase and glutamic-pyruvic transaminase. The histopathological analysis also showed that liver tissues were injured in the $AFB_1$ diet, but this effect was alleviated by the addition of 300 mg/kg ${\alpha}$-LA. Additionally, $AFB_1$ induced a profound elevation of oxidative stress in birds, as indicated by an increase in malondialdehyde level, a decrease in glutathione peroxidase activity and a depletion of the glutathione content in the liver. All of these negative effects were inhibited by treatment with ${\alpha}$-LA. Our results suggest that the inhibition of $AFB_1$-induced excess production of lipid peroxides and the maintenance of intracellular antioxidant status may play important roles in the protective effects of ${\alpha}$-LA against $AFB_1$-induced oxidative damage in the liver.
SOME GENERAL CONVERGENCE PRINCIPLES WITH APPLICATIONS
Zhou, H.Y.,Gao, G.L.,Guo, G.T.,Cho, Y.J. Korean Mathematical Society 2003 대한수학회보 Vol.40 No.3
In the present paper, some general convergence principles are established in metric spaces and then theses principles are applied to the convergence of the iterative sequences for approximating fixed points of certain classes of mappings. By virtue of our principles, most of the latest results obtained by several authors can be deduced easily.
Oviduct-specific Glycoprotein 1 Locus is Associated with Litter Size and Weight of Ovaries in Pigs
Niu, B.Y.,Xiong, Y.Z.,Li, F.E.,Jiang, S.W.,Deng, C.Y.,Ding, S.H.,Guo, W.H.,Lei, M.G.,Zheng, R.,Zuo, B.,Xu, D.Q.,Li, J.L. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.5
Oviduct-specific glycoprotein 1 (OVGP1) is implicated in playing a role in fertilization and early embryo development. In this study, we have obtained the sequence of intron 9 of OVGP1 gene in swine. Comparative sequencing of Meishan (a native Chinese breed) and Large White pig breeds revealed an A/T substitution at position 943. A PCR-EcoRI-RFLP assay was developed to detect this mutation. Polymorphism analysis in Qingping animals showed that pigs with BB genotype had lower number of piglets born alive (NBA) in multiple parities than pigs with AA (p<0.05) and AB genotype (p<0.01). In Large $White{\times}Meishan$ ($LW{\times}M$) $F_2$ offspring, the weight of both ovaries (OW) of the BB genotype was significantly lighter than that of AB (p = 0.05) and AA (p<0.01) genotypes. Analysis of the data also revealed that the mutation locus affected these two traits mostly by additive effects. These studies indicated that the polymorphism was associated with NBA and OW in two distinct populations and further investigations in more purebreds or crossbreds are needed to confirm these results.
Zhou, H.Y.,Shin, E.M.,Guo, L.Y.,Zou, L.B.,Xu, G.H.,Lee, S.H.,Ze, K.R.,Kim, E.K.,Kang, S.S.,Kim, Y.S. North-Holland ; Elsevier Science Ltd 2007 european journal of pharmacology Vol.572 No.2
The fruits of Poncirus trifoliata (L.) are widely used in Oriental medicine as a remedy for allergic inflammation. As a part of our program to screen medicinal plants for potential anti-inflammatory compounds, 21α-methylmelianodiol (21α-MMD) and 21β-methylmelianodiol (21β-MMD), which are two isomers of 21-methylmelianodiol isolated from the fruits of P. trifoliata for the first time, were found to inhibit nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages. 21α-MMD and 21β-MMD attenuated LPS-induced inducible nitric oxide synthase (iNOS) and cyclooxygenase (COX)-2 protein expressions as well as the mRNA levels of iNOS, COX-2, tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β). To investigate the mechanism involved, we examined the effect of 21α-MMD and 21β-MMD on LPS-induced nuclear factor-κB (NF-κB) activation. Both 21α-MMD and 21β-MMD significantly inhibited LPS-induced NF-κB transcriptional activity in RAW 264.7 macrophages. Moreover, the in vivo anti-inflammatory effect of 21α-MMD was examined in two mouse models of acute inflammation. In the carrageenan-induced paw edema model, administration of 21α-MMD (20 and 100 mg/kg, i.p.) dose-dependently reduced paw swelling. In addition, 21α-MMD significantly inhibited the dye leakage in an acetic acid-induced vascular permeability assay. Taken together, our data indicate that 21-methylmelianodiol is an important constituent of the fruit of P. trifoliata, and that the inhibition of iNOS and COX-2 expression by 21α-MMD and 21β-MMD might be one of the mechanisms responsible for their anti-inflammatory effects.